54 



BRITISH BELEMNITES. 



and flattened by pressure. Within this anterior conical sheath the ink-bag is seen at e, 

 somewhat decomposed, and partially altered to a dark gray colour." (' Bridgewater 

 Treatise,' vol. ii, p. 69, Ed. 1 ; and vol. ii, p. 71, Ed. 3.) The treatise just referred to 

 contains several good representations of ink-bags, supposed to be of the "Belemno-sepia," 

 which may have belonged to this species. The fine, almost complete, fossil animal figured 

 by Prof. Huxley ('Mem. Geol. Surv.,' Monogr. II, pi. i, fig. 1) is not dissimilar to the 

 specimen in Miss Philpotts' Collection, in all the sheath and phragmocone, but it is 

 believed to belong to a diflFerent species. 



The name assigned to this species in the ' Bridgewater Treatise' by Dr. Buckland, 

 having been already employed by Blainville for a very difi'erent form, cannot be re- 

 tained. Neither "B. umbilicatus" nor "B. ventro-planus" appears very suitable or of deter- 

 minate application, so that, perhaps, the exigencies of the case may be best met by a new 

 name, in honour of a great and early palaeontologist. 



Belemnites Milleri, n. s. PI. VIII, fig. 19. 



Guard. Slender, elongate, cylindroidal below the alveolar region, evenly tapering to a 

 convexo-conical or acute summit, with none or only very faint traces of striae or dorso- 

 lateral grooves ; section nearly cncular, with the axis more or less excentric. 



Var. a. Apex convexo-conical, without trace of grooves. 



j3. Apex more pointed, with traces of very short dorso-lateral grooves. 



Greatest length observed, 4 5 inches, of which the axis of the guard is 2-75, 

 Proportion of axis ta diameter at apex of phragmocone 450 to 100 in var. a ; 750 

 to 100 in var. /3. 



Ph RAGMOCONE. Only known by a longitudinal section, which exhibits septa more 

 than usually approximate, and sides somewhat arched, unitmg at an angle of 28°. 



Localities. Golden Cap, near Lyme Regis, in Middle Lias ; Blue Wick, Yorkshire, 

 in Upper Lias {Phillips). Hatch, near Taunton^ in upper part of Lower Lias, with 

 Ammonites obtusus, A. raricostatus, and Spirifer Walcotii [Moore). Lower Lias shales, 

 the Belemnite-bed, Cheltenham {Buckman). 



Observations. To judge by the drawing given by Miller to represent his Belemnites 

 elonr/atus, this might have been the species meant, without grooves or striee. Mr. 

 Sovverby's suggestion of the relationship of B. clavatus {pistilliformis, ' Min. Conch.') to 

 B. clongatus might thus acquire more probability, but the sections which I have made do 

 not show in the inner laminae the very clavate form of the young which is required by 

 the hypothesis. In Quenstedt's pi. xxix, fig. 51, we have a slightly hastate form 

 much allied to this, the specimen having been derived from the "black Alpine limestone," 

 locally associated with talc-schists, or coal-formation, and Upper Liassic shales, near 



